Automatic chucking device



J. R. cox

AUTOMATIC GHUCKING DEVICE May 2l, 1940.

Filed Jude so, 1957 s sheets-sheet 1 W M z -1 1 N NN #@Ww m MLMay21,194o. n.ox 2,201,287

` A UTGMATIC CHUCKING DEVICE Filed June 30, 1937 5 Sheets-Sheet-- 2lull] i I im l Imil INVENTOR d O H N R. C OX Eyman/mw ATTORNEYS.

May 21, 1940. J, R, COX 2,201,287

AUTOMATIC CHUCKIG DEVICE Filed June 30, 1937 3 Sheets-Sheet ."5I

Il A

INVENTOR.-

BY uol-1NR. cox.

l AnQRNEYs.

- Patented 2l, 1940y AUTOMATIC CHUCKING DEVICE i John R. Cox, Cleveland,JOhio, assignor kto Thompson Products, Inc., Cleveland, Ohio ApplicationJune so, 1937, serial'No'. 151,298

9 emma. (o1. 27a-s1) This invention relates to an automatic chuck-y ingdevice which can be employed in connectionl with all kinds of machiningor grinding operations that require chucklng o f the parts.

The object of, this invention is to provide an improved form of devicein which there is automatically eiiected engagement of the collet withthe work upon initiation of thev operation and in which there is alsoautomatically effected disengagement' of the collet from the worll: upontermination of the operation.

A further object is to devise an improved and simple but eiilcient anddependable form of mechanism for performing the intended operations andfor obtaining the advantages herein specied, such mechanism includingthe features to be hereinafter set forth and claimed.

Other objects will appear from thefollowing description and claims whenconsidered together with the accompanying drawings. p

Fig. 1 is a side View of my device with part broken away so as to showthe interior construction; 4

Fig. 2 is a top plan view thereof;

Fig. 3 is a view taken on line 3-3 of Fig. 1;

Fig. 4 is a view taken on line 4-4 of Fig. 1;

Fig. 5 is a view taken on line 5--5 of, Fig. 3;

Fig. 6 is a partial view showing the collet in released position; and 'in Fig."l is a view taken on line 1-7 of Fig. 6.

It is to be understood that the present form of disclosure is merely forpurposes of illustration and that there may be devised numerousmodifications therein without departing from the spirit of the presentinvention as herein set forth and claimed. v

Suitably mounted within the housing I there is the rotatable hollowspindle 2 which has the collet 3 located at the one end thereof and theoperating means therefor located at the other end thereof., as will beunderstood from Fig. l of the present drawings. Any suitable form ofcollet may be employed.

In the present illustration, the collet 3 is Athreaded upon the end ofthe hollow rod or push tube 4, while the tapered ends thereof areadapted for wedging engagement with the correspondingly inclined face ofthe removable end member 5 of the spindle, and the coil spring 6 isarranged between a flange of the collet 3 and the end of member 5. Thefunction of spring 6 is to effect withdrawal of the collet from engagingposition when released, as will be understood. In Fig. 1, the collet isshown inl engagement with a piece of work A; while in Fig. 6, the colletis shown in lreleased position for insertion or removal of the work.

It will be understood that the collet is caused to be engaged ordisengaged by movement of the hollow rod 4 along the longitudinal axisthereof which corresponds with that of the collet, this rod 4 extendingco-axially through the spindle 2. The mechanism for manipulating the rod4 will now be described.

The one end portion of` spindle 2 is slotted diametricall as indicatedat 2a, so as to permit the extension of. the inner ends of the duplicatefingers or levers therethrough, the ingers 1 being pivotally mountedupon the ring 8 which is carried by the spindle 2. Thus the spindle andfingers 'I always rotate together. The inner ends of fingers I areadapted to engage the end of the hollow rod 4 so as to move the sametowards the right when the inner ends of the fingers are rocked towardsthe rod. By means of the adjusting nut 8a, the iinger holder 8 can bepositioned so as to bring the fingers 1 in correct engagement with thehollow rod for clamping engagement with the collet at the other endofthe device. The collet will be closed by a movement of rod 4 to theright a distance of approximately one-thirty-second (1/32) of an inch.

The outer ends of the fingers l have mounted thereupon the rollers 9 forengagement by the annular cam portions I0 of the cam ring member I Iwhich is attached to the drive pulley I2. The pulley I2 isconcentrically and freely mounted upon the spindle 2 by means of theball bearing indicatedat I3. The ball bearing'is locked in place againstthe shoulder of spindle 2 by means of nut I3a, and the ball bearing iscapable of taking a thrust load as well as radial load.

At-diametrically opposite points upon the cam member II there areprovided slots for sets of leaf springs I4 within the angular clamps I5which are secured inposition by means of the set screws I6. OThesesprings are located at the end of. the high part of the cam Ii, in eachcase, and the free ends of the spring leaves in each instance extendinto the path of the roller 9. The

rollers, after they have come into engagement with the high parts of thecam member, will engage the spring leaves and thereby effect appositivedrive connection between the pulley I2 and spindle 2. Moreover, thecushioning effect of the spring leaves will absorb any shock which mightotherwise be transmitted by a sudden engagement between these parts.Also, the spring leaves serve as a cushion stop means for the rollers-9v upon the other side thereof when the parts are released, as will beexplained below.

The pulley I2 is driven by the belts II from any suitable form of. motorwith a brake for quick stopping. In the present case, I have shown anelectric motor I8 with a magnetic brake. In the main line circuit Ihaveprovided the push button I9 by means of which the present device canbe placed in operation for any desired period of time, this button being,located within easy reach of the operator while operating the device.

The operation of the device will now be described. Assuming the spindle2 to be at rest, the cam rollers 9 are opposite the low' partsof the cammember and consequently the clamping rod 4 is free and the collet isA inreleasedposltion. Then upon depressing and holding the switch button inclosed position, the magnetic brake of the motor is released and thepulley starts to lrotate. Due to the inertia4 of spindle Zand thenger-holder 8, these parts will remain still while the cam member IIrotates and until the high parts 'III of the cam come into engagementwith the rollers 9 and turn the inner ends of the iingers' I towards therod. This will cause the Y clamping ,rod 4 to move towards the right, as

viewed in Fig. 1, and thereby close the collet into engagement with thework A which has been inserted into proper position by the operator. Therotary movement of the cam member II as just described, will cause therollers 9 to be engaged by the leaf springs I4 and thereby effect .apositive drive connection. Then the pulley I2, cam member II, fingers'I, finger-holder 8 and spindle 2 rotate as a unit, with the collet ineffective engagement with the work. Any shock which might otherwise beincident to effecting the positive drive connection, above referred t0,is precluded by the cushioning effect of the bundles of leaf springs, asalready explained.

When the switch I9 is opened for stopping the operation, the magneticbrake will cause the motor and consequently the pulley unit to stopquickly; but the spindle-2, due to momentum,

continues to rotate and carries the ngers I with it. This relativemovement `between the cam member and the fingers causes the rollers 9 tomove off of the high parts of the cam member and to come opposite thelow parts thereof, with the result that the lspring 6 then moves the rod4 to the left, as viewed in Fig. 1, so as to release 5 the collet fromengagement .with` the work, and the inner ends of the ngers 'I arecaused to turn away from rod 4. In case the relative rotary movement-between the cam member II and the iingers 'I should continue to the endof the low parts of the cam member, the rollers 9 will finally beengaged by the other side of the leaf springs' I4 so as to absorb anyshock. Thus when the spindle stops, the collet is out of engagement withthe work. Upon removal of the work therefrom,

the above-described operation may be repeatedv as often as desired.

Notably among the advantages of this type of.

connections actuated by said driving means for l effecting engagementand disengagement of the collet with the work and for eifectingconnection and disconnection of the collet with said driving means, theengagement of the collet with the work taking place prior to theconnection of the lcollet with the driving means and the disengage-vconnection for the collet with said rotatable drive means. i

3. An automatic chucking device comprising a rotatable collet,cop-axially disposed rotatable means therefor, said `rotatable meansincluding a longitudinally manipulatable means fory effecting engagementof the collet with the work, companion rotatable means' arrangedco-axially with respect to said first rotatable means, cam means carriedby said companion rotatable means, lever means carried by saidfirst-named rotatable means and ,having operative engagement'with saidcam means and with said manipulatable means for effecting operation ofsaid manipula--` table means, and means carried by said companionrotatable means for engagement by said lever means so as to provide avdrive connection be# tween said two rotatable means, and means foroperating said companion rotatable means.

4. lAn automatic chucking device comprising a rotatable collet, aco-axially disposed rotatable spindle,l a longitudinally manipulatablerod, ar-

ranged within said spindle, for eii'ectingengage-- ment-of the colletwith the work, a rotatable ring surrounding said spindle, cam meanscarried by said ring, lever means vcarried by said spindle and extendingtherethrough so as to have operative relation at the inner end thereofwith said rod and at the other end thereof with said cam means, andmeans carried by said ring for engagement by the outer end of said levermeans so as to provide a rotary drive connection between Y said spindleand ring, and means for operating said ring.

5. An automatic chucking device comprising a. rotatable collet,co-axially disposed freely mounted rotatable means therefor includinglongitudinally manipulatable means for effecting engagement of thecollet with the work, companion rotatable means arranged co-axiallyabout said rst-named rotatable means, cam means carried Yby saidcompanion rotatable meanslever means carried by said first-namedrotatable-means and having operative engagement with said cam means andwith said manipulatable means for effecting operation of saidmanipulatable means, and means carried by said companion rotatablemeansfor engagement by said lever means so as to provide anautomatically engageable and releasable one-way drive connection betweensaid two rotatable means, and means for operating said companionrotatable means.

6.y An automatic chucking device comprising a I rotatable collet,co-axially disposed freely mounted rotatable means therefor includinglongitudinally manipulatable means foreifecting engagement of lthecollet-withthe work, companion ro 4tatable means arranged'co-axially'about said rst-named rotatable means, lcam means carried by said.companion rotatable means, lever means carried by said first-namedrotatable means and havingy operative engagement with lsaid cam meansand with said manipulatable means for effecting operation of saidmanipulatable means,

.means for operating said companion rotatablemeans and means forstoppingthe same,v and twoeway cushion means carried by and extending from saidcompanion rotatable 'means into thev 1 path of said lever means forcushioned engagement thereby so as toprovide, an automatically.engageable and releasable one-way drive connection between said tworotatablemeans and to provide also a cushioned stop means-for said levermeans upon stopping saidV companion rotatable means; l

-7. 'An' automatic chucking device comprisingv 'means and with saidmanipulatable meansfor effecting operation of said manipulatable means,means providing operative connection between said two rotatable meanswith preliminary relative movement therebetween, and means for `op"erating said companion rotatable means so as'to a effect preliminar-ilyan automatic engagement of said `collet through said lever means andvsaid manipulatable means as a result 4of the initial whereby the Workwill be engaged by the collet vprior to the rotatable operation thereof.

y 8. An automat-ic chucking device comprising a rotatableA collet,co-axially disposed freely mounted rotatable means therefor includinglongitudinally manipulatable means for effecting engagement of thecollet with the work, companion rotatable means arranged io-axiallyabout said `first-named rotatable means,l cam means carried by saidcompanion rotatable means, leverV means carried' by said first-namedrotatable means and havingv operative engagement with said cam means andwith said vmanipulatable 4means for eiecting operation ofsaidmanipulat-Y able means; meansproviding operative connection betweensaid two rotatable means with rel- 3 movement of the companion rotatablemeans rel- I u atively to -said --rst-named rotatable means,

ative movement therebetween dining' the stopping operation, anddisconnectible means for voperating said companion rotatable means so asto effect an automaticrelease of said collet through saidmanipulatablemeans and said lever -l means as la lresult of continued movement ofsaid first-named rotatable means relatively 'to said companion rotatablemeans', whereby the collet is automaticallydisengaged from the work uponstoppingl the device.` f

v9.,An automatic chucking device comprising a rotatable collet,co-axially disposed manipulatable means for effecting engagement ofthecol- .let with ',the-work, rotatable drive Vmeans arranged co-axiallywith respect to said manipulatable means, 'means actuated `by saidrotatable drive means for effecting operation of saidmanipulatable meansand 'for effecting drive con- .mean v v f JOHN R. COX.

l nection of the collet withl said rotatable drive

